Place: in, on and at

Use in for an enclosed space or a larger area: in a room, in a city, in the United States. Use on for a surface or a line: on the table, on the wall, on Main Street. Use at for a point or exact place: at the door, at school, at 25 King Street.

The same three words organize time. Use in with months, years, seasons, and longer periods; on with days and dates; and at with clock times and precise moments.

Learn common expressions as complete phrases. American English normally says on the weekend, on a street, and in a neighborhood. Context decides whether you mean an area, a surface, or a point.